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Technically it's not the tip of a spark plug, but a shard of the ceramic insulator when shattered- https://en.wikipedia.org/wiki/Ninja_rocks https://en.wikipedi
by ayemiller 5y ago
Technically it's not the tip of a spark plug, but a shard of the ceramic insulator when shattered- https://en.wikipedia.org/wiki/Ninja_rocks https://en.wikipedia.org/wiki/Ninja_rocks
- brokenmachine 5y agoSo they crush a spark plug to get the "rocks"? How?